Infiniti QX4 Workshop Manuals and Repair Manuals

The engine oil in the Infiniti QX4 should be changed every 5,000 miles or every six months, whichever comes first. Regular oil changes are crucial to maintain the performance and longevity of the engine, as clean oil helps lubricate the moving parts and prevents excessive wear and tear. Neglecting regular oil changes can lead to engine damage and decreased fuel efficiency.

The coolant in the Infiniti QX4 should be flushed and replaced every 50,000 to 100,000 miles or as recommended by the manufacturer. Over time, coolant can become contaminated or lose its effectiveness, leading to engine overheating and potential damage. Regular coolant replacement helps maintain proper engine temperature and prolongs the lifespan of the cooling system components.

The air filter in the Infiniti QX4 should be replaced every 12,000 to 15,000 miles or as recommended by the manufacturer. A clogged or dirty air filter can restrict airflow to the engine, reducing fuel efficiency and potentially causing engine performance issues. Regularly replacing the air filter helps maintain proper engine function and improves overall vehicle performance.

The brake pads in the Infiniti QX4 should be replaced when they are worn down to a thickness of 3mm or less. However, the exact replacement interval can vary depending on driving habits, road conditions, and the type of brake pads used. Regularly inspecting the brake pads and having them replaced when necessary helps ensure optimal braking performance and prevents potential brake system damage.

The cabin air filter in the Infiniti QX4 should be replaced every 12,000 to 15,000 miles or as recommended by the manufacturer. A dirty or clogged cabin air filter can reduce the effectiveness of the vehicle's heating, ventilation, and air conditioning system. Regular replacement of the cabin air filter helps maintain clean and fresh air inside the vehicle and ensures proper HVAC system operation.

The fuel filter in the Infiniti QX4 should be replaced every 60,000 to 90,000 miles or as recommended by the manufacturer. The fuel filter plays a crucial role in preventing contaminants from reaching the fuel injectors and potentially causing engine performance issues. Regular replacement of the fuel filter helps maintain proper fuel flow and protects the fuel system components from damage.

The spark plugs in the Infiniti QX4 should be replaced every 60,000 to 100,000 miles or as recommended by the manufacturer. Spark plugs play a crucial role in igniting the air-fuel mixture in the engine cylinders. Worn-out spark plugs can cause misfires, reduced fuel efficiency, and engine performance issues. Regular replacement of the spark plugs helps ensure optimal combustion and overall engine performance.

The transmission fluid in the Infiniti QX4 should be replaced every 30,000 to 60,000 miles or as recommended by the manufacturer. Regular maintenance of the transmission fluid helps ensure smooth gear shifting, prolongs the lifespan of the transmission components, and prevents potential transmission issues. Neglecting to replace the transmission fluid can lead to degraded performance and costly repairs.

The tires on the Infiniti QX4 should be rotated every 5,000 to 7,500 miles or as recommended by the manufacturer. Regular tire rotation helps ensure even tire wear, prolongs the lifespan of the tires, and maintains optimal vehicle handling and performance. Neglecting tire rotation may lead to uneven wear patterns, decreased traction, and the need for premature tire replacement.

The recommended tire pressure for the Infiniti QX4 can be found in the owner's manual or on a sticker located on the driver's side door jamb. It is important to maintain the proper tire pressure to ensure safe driving, optimal fuel efficiency, and even tire wear. Regularly checking and adjusting the tire pressure according to the manufacturer's specifications is essential for the vehicle's performance and safety.

If the check engine light illuminates in the Infiniti QX4, it is recommended to have the vehicle inspected by a qualified technician to diagnose the underlying issue. The check engine light can indicate various problems, ranging from minor issues to more significant engine or emissions-related faults. Ignoring the check engine light may lead to further damage or reduced performance, so it is crucial to address the issue promptly.

The Infiniti QX4 requires premium unleaded gasoline with an octane rating of at least 91. Using lower octane fuel can lead to engine knocking, reduced performance, and potential damage to the engine. It is important to follow the manufacturer's recommendation for fuel type to ensure optimal performance and avoid potential issues.

The Infiniti QX4 uses power steering fluid that meets the manufacturer's specifications, typically described as Dexron III/Mercon or equivalent. It is essential to use the correct type of power steering fluid to ensure proper lubrication, smooth steering operation, and prevent potential damage to the power steering system components. Checking the owner's manual or consulting with a qualified technician can provide the specific fluid recommendation for your vehicle.

The timing belt in the Infiniti QX4 should be replaced every 90,000 to 105,000 miles or as recommended by the manufacturer. The timing belt is a critical component that synchronizes the rotation of the engine's camshaft and crankshaft. If the timing belt fails, it can lead to severe engine damage. Regular replacement of the timing belt is essential to prevent costly repairs and ensure the engine's proper operation.